Update Gradle to 8.8 and AGP to 8.4.1
Update Gradle to 8.8 and AGP to 8.4.1. Requires Android Studio 2023.3.1 Jellyfish to build. Gets us ready for SDK 35 later this year, where AGP 8.4 is required. Checksums are published here: https://gradle.org/release-checksums/